Strong’s Greek
G1177 — dekaduo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
δεκαδύο
dekaduo — pronounced dek-ad-oo'-o
from 1176 and 1417; two and ten, i.e. twelve:--twelve. see GREEK for 1176 see GREEK for 1417
2 occurrences in the KJV.
Acts 19:7
And all the men were about twelve.
Acts 24:11
Because that thou mayest understand, that there are yet but twelve days since I went up to Jerusalem for to worship.